1200/x-10=1200/1.5x
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1200/x-10=1200/1.5x1200/x-10=1200/1.5x1200/x-10=1200/1.5x1200/x-10=1200/1.5x1200/x-1200/1.5x=101200/
1200/x-10=1200/1.5x
1200/x-10=1200/1.5x
1200/x-10=1200/1.5x
1200/x-10=1200/1.5x
1200/x-1200/1.5x=10
1200/x-800/x=10
400/x=10
x=40